Delivering polymer properties using speciality additives based on smectite minerals

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Delivering polymer properties using speciality
additives based on smectite minerals
Cinzia Della Porta - Laviosa Chimica Mineraria
SpA Livorno Italy
Nanocomposites 2002 Amsterdam 28-29 January
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From mine to plastic
Natural montmorillonite
nanoclay
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Origin
variability of the mineralogical and chemical
composition

• alteration of volcanic ash
• hydrothermal alteration of volcanic rocks

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structure
The crystallographic basis of montmorillonite is
21 layered structure a single layer of aluminium
octahedron between two sheets of SiO4 tetrahedrons
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The elementary particle is a platelet every
single platelet is about 1 nm thin

• the various platelets are held together in
  packets by electrostatic and
• Van der Waals forces
• they can be exfoliated and dispersed in
  submicronic particles

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From mine to nanoclay

• selection of montmorillonite
• purification
• reaction of modification
• drying process
• production of powder

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Selection of montmorillonite
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Selection of montmorillonite
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Selection of clay
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Variables in the Process

• selection of material for different
  viscosity
• level of purification
• reaction
• modifier

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Dellite HPS High Purified Sodic Montmorillonite
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Dellite HPS an example in a starch based
nanocomposite
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Different montmorillonite
EVA 10 sample1 XRD 4,13
nm intercalated nanoclay
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Different montmorillonite
EVA sample2 XRD 3,97 nm some
intercalated material
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Different montmorillonite
EVA Dellite 72T XRD no ads exfoliated
nanocomposite
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Mechanism of activation
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Not only the modifier...

• For a successful nanocomposite synthesis you have
  to choose the right modifier but also the right
  raw material
• The right raw material is dependent on the kind
  of polymer you are processing

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Products

• Dellite HPS and Dellite GSA for high polar
  polymer
• Dellite 72T and Dellite 67G for polyolefin
• Dellite 43B for aromatic polymers

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